When I got my D2x, the first thing I did was throw my 50 1.4 (my sharpest lens) on it and shoot a focus test target. All was well so I thought I'd dodged the focus problem bullet. Now it appears I wasn't so lucky. After a weekend shoot, I was dissapointed at how many soft photos I got. I decided to repeat the focus test with each lens. The results mirror my weekend experience. Here's how they break down... Nikkor 12-24 9 of the 11 focus points either front or back focus Nikkor 24-120 6 of the 11 focus points either front or back focus Sigma 70-200 2.8 2 of the 11 focus points either front or back focus Sigma 105 2.8 perfect focus Nikkor 50 1.4 perfect focus http://www.ridges.dynip.com/images/D2x/Focus_test/ I spoke to Nikon this morning and I'll be send the camera in with the 12-24 and 24-120. The rep thought that after it's adjusted with those lens, the sigma zoom should work fine as well. This will be the first time I've had to use Nikon service. I hope it's a good experience. I'm not too thrilled at the cost of shipping everything and paying for $7500 insurance though.